Russian M1875 Ghan-Krnka rampart rifle, .80 cal, 20.3x95R - suggested use for shoot of German and Austrian armoured cars, at 1915. Bullet (caliber - 20.98 mm) - armour-pierced with iron or steel core, 128 g (1975 gr), 23.4 g (361 gr) black powder, weight of cartridge 204 g (3148 gr). Weight of gun - 20.5 kg (45.2 lbs), lenght of barrel - 914 mm (36 inch), full lenght - 1440 mm (56.7 inch). Muzzle velocity - 427 mps (1400 fps), energy - 11 670 Joules. Piercing of 7.62 mm (.3 inch) iron sheet - on 854 m 100%, on 1067 m 50%. Recoil pad - with damping, for decrease of recoil. I haven’t data about use of this gun at WW1.
Civil Zhelyazko from Warsaw proposed a “hand cannon” at 1915, but, I don’t know a details.
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Rheinmetall in 1918 proposed anti-tank rocket launcher with HE charge.
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British/American early AT cartridge (.50 Colt-Kynoch):
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Oohh slow burn weapons? This should be very interesting. Very low velocity, but still interesting
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LOOK AT THE PRICE OF AMMO BACK THEN
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is that per bullet or crate ?